Device for graphically reproducing sound-waves.



-H. G. DORSEY. DEVICE FOR GBAPHIOALLY BEPRODUGING SOUND WAVES.

APPLIUATION FILED Brumm. 1910. 1,017,392, Patented Feb.13,1912.

2 SHEETS-SHEET 2 WIT NESSE 5 INVENTO? m'omvfrs HERBERT GROVE DQRSEY,

0F ITHACA, NEW YORK.

DEVICE FOR GRAPHICALLY ,REPRODUCING SOUND-WAVES.

Specilication o( Letters latent.

Patent-.ed Feb. 13, 1912.

Application tiled' September 29, 1910. Serial No. 584,432.

view, partly in section, showing a tele hone To all whom it may concern:

Be it known that I, HERBERT G; Donsnr, a citizen of the United States, and a resident of Ithaca, in the county of Tompkins and State of New York, have invented -a new and Improved Device for Graphically Reroducing Sound-Waves, 4of which the following is a full, clear, and exact description.

An object of the invention is to provide a device for graphically reproducing sound waves, so that the same can be relatively Y' compared and accurately measured.' For the purpose mentioned use is made of a corrugated indented sound-receiving diaphragm, an adjustably mounted mirror, and a connection between the diaphragm and the mirror whereby `the mirror will operate wheni sound waves are received on the diaphragm.

Although I am aware that sound-reproducing devices havetbeen used heretofore, the `inconsistency of the readings obtained and the intricacies of the constructions involved have made these devices uiipractical for commercial use and experiment.

In order to obtain perfection in measuring sound waves, the mentioned waves must be accurately received and transmitted, so that each distinct feature of a plurality of waves can be quickly and easil noticed, and. it is with this invention that I avc obtained the desired result. With my device I first receive the sound on a diaphragm, transmit it to a movable mirror and then by the insertion of a revolving mirror or suitable lens, I project the sound waves graphically on to a screen or plate, thus insuring a graphic picture of the waves as they were previously received on the diaphragm.

Reference is to be had to the accompany ing drawings, forming a part of this specification, in which similar characters of reierence indicate corresponding parts in all the figures, and in which- Figure 1 is a vertical sectional view showing the interior arrangement of my device; Fig. 2 is an end view lookin into the device when the cover is remove and disclosing the adjustable mirror and adjacent operative parts; Fig. 3 is a sectional view taken on the line 3*-3 in Fig. 2, and showing the spindle and transmitting bow; and Fig. 4 is a side elevation of the diaphragm adapted to primarily receive the sound Waves. Fig. o is a side view, partly in section, of a telephone receiver having the cover thereof fitted with the spindle and bow; Fig. 6 is a receiver having my device removab y secured thereto.

Referring more particularly to the various drawings, I provide a circular casing 10, having therein a partition 11, forming separate compartments 12, 13 and a transmitting horn 14, screW-threadedly secured at one end of the compartment 13. An integral bracket 15 is provided for rigidl .securing the casing 10, and a-cover 16 1s a apted to screW-threadedly engage. the casin at one end thereof. A diaphragm 17 provided with annular corru ations 18 andtransversely-extending incentations 19, is secured in the compartment V13 of the casing 10, and a hook 20 is centrally secured to one side of the diaphragm. A forked bridge 21 i is mounted in the compartment 12 by means of a flexible member 22 and a screw 23 engages the casing 10 sind the bridge 21, for adjusting the same. Mounted in suitable bearings 24 on having a flattened portion 26 and secured to the said flattened portion is a mirror 27. A bow 28 provided with a flexible cord or wire 29 is secured to the diaphragm 17.with the cord 29 in engagement with the spindle 25, as will easily be seen in Fig. 3, the said bow and cord being adapted toextend through nu aperture 30 in the partition 11.

In the operation of my device, sound waves enter the horn 14 and strike the diaphragm 17, which owing to its iiexibility and sensitiveness, actuates the bow 28,110 operate the mirror 27. Now, if a ra of light is cast upon the mirror 27 and regected from the mirror 27 to a revolving mirror spaced from the mirror 27, end which in turn reflects the light on to a suitable screen, any movement of the mirror 27 will be relected to the revolving mirror and on to the screen.' If the revolving mirror were held in stationary position, only a spot of light would be cast upon the screen, but in view of the turning motion of the revolving mirror, the ray of light from the mirror 27 is projected on theA screen ina line, which owing to the sound waves striking the diaphragm 17, will move upwardly and downwardly, the length and Width of these rettical movements or strokes being pro ortional to the strength and periodicity of t e sound waves striking the diaphragm 17.,

B5 Vdisposing a` photographic film in placf of the revolving mirror an the bridge 21, is a spindle 25 lacing the whole device in a dark room, the ray of light will be projected on to the film and a perfect photogra )hic reproduction of the soundA waves can e secured.

lilo; securing a wire or cord to the hook 20 on the diaphragm 17 and subjecting the wire or .ifi to heat or cold, the coeilicient of expansion of the particular material employed can easily be ascertained. Thus it4 will be .seen that aside from measuring sound waves, iny device can also be accurately emin physical research. and the like.

My deyice is especially' adapted for use in cdmbjnation with a telephone receiver and in Figs. 5 and 6 I have illustrated two forms thereof. Referring particularly to Fig. 5,

the casing 1i@ of theirereiver contains the usual electromaghi-:tsv 100, the diaphragm 117, such as is commonly used in these devices, being held in position by the removable cap or cover 11G; this cap or cover may be provided with an integral bracket 101 through which the screw 123 passes which is in engagement with the forked bridge 121 which is provided with the dexiblc member 1*'22, as previously described. The bow 128 has one end seclxred to the di aphragm 117 in any sniable manner, the cord or wire 1:29 of the how passing around and engaging the spinde 1 previously set forth; the mirror ifT is suitably secured to thc spindle, being nr? cated ity the cord of wire 129. The cap or cover X16 with the bracket. 101 thereon may be supplied with my device, thereby adapting it to be used with telephone receivers that are of a standard make. In this case the diaphragm 117 is actuated by the varying currents flowing around the eiectrom'agnets, this actuation giving rise to the movement of the mirror whereby the characteristics ot' the sound waves may be determined.

In Fig. 6 thc easing 110 of the telephone rereivcr is provided with the usual cap or cover HU', my device being contained within a suitable casing 1.10', one end of which is provided 'with an annular shoulder or offset 112 through which a plurality of screws 113 ,are adapted to be passed in order to secure the ing tothe cap 116. The diaphragm 1 ET" ot the device is in engagement with one end ofthe l, .iw 125, as previously set forth, the diaphragm 11.1n of the receiver being con nccted to the irst-mentioned diaphragm by means of an element 200 which is secured to each of these parts in any desirable and ctective manner. The operation of this device is identical with what has been already described, it being noted that the diaphragm 11T is vibratcd similarlyto the dia hragm 117 of' the receiver through the me iurn of this ele-ment. lf so desired, a cover 114 may be provided therefor in order to protect the parts when not in use. By providing' cas ing similar to thatindicaed atll() wlth the bow and the spindle mounted in the bridge thereon, the device is well adapted for at.v tachmcnt to and use with telephone receivers as they are now made.

Vhilc l. have shown three adaptations of my device, one ot' which is adapted to be actuated directly ny sound waves and the other two by vibration of a diaphragm caused by varying electric currents, it is clear that other methods of actuating the diaphragm and devices with which thel in vention may be Yused will suggest themselves to a person skilled in this art, such constructions fallin within the spirit of my inven tion and being included within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent-y 1. A device of the class described com-- prising a corrugated indented diaphragm with the indentations crossing the corrugations, an adjustable mirror, and means connccting the diaphragm and the said mirror for operating the mirror when the diaphragm is actuated.

f2. A device of the class described coinprising a diaphragm, circular corrugations on. the diaphragm with radial indentations crossing the said corrngations. a mirror, means for adjustably supgliorting the mirror, and a bow connecting the diaphragm and the mirror for operating the mirror when the diaphragm is actuated.

3. A device of the class described compris ing a casing having a tapered end, a. diaphragm therein, the said diaphragm being corrugated in one direction and having indentations crossing the said corrugations, a mirror mounted on the casing, means for adjusting the mirror, means connecting the mirror and diaphragm for operating the mirror when the diaphragm is actuated, a horn for attachment to the said taperedend of the casing and a bracket integrally formed on the casing and depending therefrom.

4. A device of the class described comprising a casing, a diaphragm therein, the said diaphragm bein corrugated in one direction and having incV entations crossing the said corrngations, a mirror mounted on e spindle on the casing, means for adjustin the mirror, and a bow connecting the iaphragm and the said mirror for operating the mirror when the diaphragm is actuated, the said bow consisting of a curved rod having a iexible member connected to im ends with lthe said member encirclingl the spindle of the mirror intermediate e ends of the bow.

5. A device ofthe class described comprising a corrugated diaphragm provided with indentations crossing the corrugations and in lines relatively at right angles, a mirror,

mennef l'nr udjnting the, lnirrm and means ennneelirwtlie dinpln'ngnl and snid mirror for openmng the niirl'nr when die di(- pln-:ig'm is aetlnded.

(3. deriee nlf llie class deseribed enmprising n easing'. n dinplirngnn therein. :i fnrked bridge ninnnted in the naming', Inenns l'nr :\(lpr-'lir|g ille, bridge e'xterinrly of tlie rinsing'. n mirror nwnnied nn n 4Spindle pivolnll) cnrlied by tlie bridge, und :l bnn' Heenred in [lle diaphragm sind engaging [be mid Spindle, to operate the same.

7. ln :i leriee nl llie elzws deseribed. :i ennine;h n dinplirngln lnnnnled in [lle raising. :i bridge in (lie easing n spindle on (lle bridge. :i niirrnr snprmrled nn ille spindle, lngellier will| n bm' ennner-linn' tbe .mid di:|pl|l'u; 'n1 und llie nld LQpindle for inm'ing the lnirrnr when ille linplnne'na i nelfniled. llle miel bow beiney nnnle np nl' rnd imvinp; n lle.\i ble nlelnlier eunneelell in ilends. llie snid "member eneirelineY (be \'pindle between (be ends' nl ille Huid rnd.

8. ln n derive nl' il|e r'lnri desvribed. n easing, ai dinplira'nl'ln nl-nlnled wilbin ille, easing', :l bridge nilliin Ille enhingl. n .spindle nn the bridge, :i lnirrnr nmnnled nn tbe spindle7 :und a bon' eninprihing :i llexilile member, one end of the bow being connected ln and actuated by the said flinpln'ng'ln, the said flexible member being in engagement willi the periphery nf die said lQpindle \\'l1ereby movement nf the diaphragm trnnsnnl'led tn the snid Cipindle.

Sl. In n deriee 0f ille class described, n easing, n corrugated diapllrngm mounted in the easing' and provided with radial lines 01" indenfzdions, eneli of the Said indentalinnf: in enel] line being disposed un me nf ille said Corrngnlinns. n forked bridge in the. easing, :i lspindle 0n the bridge, :1 mirror n'mvubly nimm.' d on the spindle, and u bn'w ennneexingi' the Huid diuplirngln und said .spindle lnr nmring' llie inirrer when tbe diapln'ngln is neilnded, ille said bow com-intingr nl' n rnd lnlring n lexible member enrireling' the spindle between the ends of the su id rnd.

ln testin'lnny whereof I lnlve signed my inline in this speeilienlinn in tbe presence of lwn .Llnliheribing wilnexses.

HERBERT GROVE DORSEY. 'inesnes:

Vninmu Il. Donsm', E. J. Dnnsm'. 

